Updated Python command to specify version 3 for

build step

Modified the build command in the CI workflow to explicitly call Python
3 to ensure compatibility and avoid potential conflicts with systems
where Python 2 is the default. This change aligns the build process with
modern Python practices and reduces ambiguity in environments where
multiple Python versions are available.

.github/workflows/python-package-ubuntu.yml

@@ -26,4 +26,4 @@ jobs:
 
     - name: Build the package
       run: |
-        python -m build
+        python3 -m build